mirror of https://github.com/OpenTTD/OpenTTD.git
60 lines
1.0 KiB
C
60 lines
1.0 KiB
C
/* $Id$ */
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#include "stdafx.h"
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#include "tile.h"
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void SetMapExtraBits(TileIndex tile, byte bits)
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{
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assert(tile < MapSize());
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SB(_m[tile].extra, 0, 2, bits & 3);
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}
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uint GetMapExtraBits(TileIndex tile)
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{
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assert(tile < MapSize());
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return GB(_m[tile].extra, 0, 2);
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}
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uint GetTileSlope(TileIndex tile, uint *h)
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{
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uint a;
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uint b;
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uint c;
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uint d;
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uint min;
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uint r;
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assert(tile < MapSize());
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if (TileX(tile) == MapMaxX() || TileY(tile) == MapMaxY()) {
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if (h != NULL) *h = 0;
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return 0;
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}
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min = a = TileHeight(tile);
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b = TileHeight(tile + TileDiffXY(1, 0));
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if (min >= b) min = b;
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c = TileHeight(tile + TileDiffXY(0, 1));
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if (min >= c) min = c;
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d = TileHeight(tile + TileDiffXY(1, 1));
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if (min >= d) min = d;
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r = 0;
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if ((a -= min) != 0) r += (--a << 4) + 8;
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if ((c -= min) != 0) r += (--c << 4) + 4;
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if ((d -= min) != 0) r += (--d << 4) + 2;
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if ((b -= min) != 0) r += (--b << 4) + 1;
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if (h != NULL) *h = min * 8;
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return r;
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}
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uint GetTileZ(TileIndex tile)
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{
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uint h;
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GetTileSlope(tile, &h);
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return h;
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}
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